Greenheck Fan manual GB-180 G-183, Maximum BHP AT a Given RPM = RPM/1149

Roof Downblast - Exhaust

Belt & Direct Drive

GB-180 • G-183

351⁄2

(902)

		(Pa)
	*28
	(711)	Pressure
51⁄2 (140)		Static
13⁄4 (44)

30

(762)

Damper Size = 18 x 18 (457 x 457) Roof Opening = 201/2 x 201/2 (521 x 521)

Shroud Thickness = 0.064 (1.6) Motor Cover Thickness = 0.040 (1.0) Curb Cap Thickness = 0.064 (1.6)

^Approximate Unit Weight G/GB = 108/142 lbs. (49/64 kg)

All dimensions in inches (millimeters).. *May be greater depending on motor. ^Weight shown is largest cataloged Open Drip-Proof motor.

RPM (Belt)

RPM (Direct)

HP

Density 0.075 lb/ft3

Density 1.2 kg/m3

wg)

E

V

R

(in.

U

M

C

Pressure

E

T

S

S

Y

S

T

H

I

F

Static

O

F

T

E

L

E

H

T

O

T

T

C

E

L

E

S

T

O

N

O

D

Volume (cfm)

Volume (m3 /hr )

Direct Drive RPM

C-860 RPM B-1140 RPM

Motor HP		Fan					Static Pressure in Inches wg
Belt	Direct	RPM		0	0..125	0..25	0..5	0..75	1	1..25	1..5	1..75	2
180	183
		495	CFM	1925	1646	1150
			BHP	0..067	0..078	0..075			MAXIMUM BHP AT A GIVEN RPM = (RPM/1149)3
1/4			Sones	4..3	4..7	4..1				MAXIMUM RPM = 1460
			CFM	2839	2668	2469	1882		TIP SPEED (ft/min) = RPM x 4.843
		730							MAXIMUM MOTOR FRAME SIZE = 184T
			BHP	0..21	0..23	0..25	0..25
			Sones	7..4	8..7	7..2	6..7
			CFM	3150	2997	2832	2375
1/3		810	BHP	0..29	0..31	0..33	0..35
			Sones	8..8	9..9	8..7	8..2
			CFM	3208	3059	2899	2458
		825	BHP	0..31	0..32	0..35	0..37
			Sones	9..1	10..2	9..0	8..6	8..5
			CFM	3344	3202	3049	2647	2015
1/2	C-1/2	860	BHP	0..35	0..36	0..39	0..42	0..4
			Sones	10..1	10..8	9..8	9..1	8..1
			CFM	3655	3527	3388	3052	2601
		940	BHP	0..46	0..47	0..49	0..54	0..54
			Sones	12..7	12..8	12	11..1	10..3
			CFM	4102	3990	3867	3596	3252	2811
3/4		1055	BHP	0..65	0..67	0..68	0..74	0..77	0..77
			Sones	16..2	15..7	14..9	14	12..9	12..4
			CFM	4433	4329	4216	3980	3684	3328	2856
	B-1	1140	BHP	0..81	0..84	0..85	0..93	0..96	0..98	0..95
1			Sones	17..9	17..4	16..8	16	15..1	14..3	13..6
			CFM	4608	4508	4401	4179	3900	3575	3178	2499
		1185	BHP	0..91	0..94	0..96	1..03	1..07	1..1	1..09	0..99
			Sones	19	18..4	17..8	17..1	16..2	15..4	14..7	13..7
			CFM	5191	5102	5010	4814	4599	4344	4052	3713	3262
1-1/2		1335	BHP	1..31	1..33	1..36	1..41	1..49	1..54	1..57	1..56	1..51
			Sones	22	22	21	21	19..9	19..2	18..7	18..2	17..6
			CFM	5677	5596	5514	5336	5155	4938	4699	4426	4123	3765
2		1460	BHP	1..71	1..74	1..77	1..81	1..93	1..97	2..03	2..05	2..05	2..02
			Sones	26	25	24	24	23	23	22	22	22	21

Performance certified is for installation type A: Free inlet, Free outlet. Power rating (BHP) does not include transmission losses. Performance ratings include the effects of a birdscreen. The sound ratings shown are loudness values in hemispherical sones at 5 ft. (1.5 m) in a hemispherical free field calculated per AMCA Standard 301. Values shown are for installation type A: free inlet hemispherical sone levels.

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